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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Fixed Rate Notes (Details)	Dec. 31, 2024 USD ($) aircraft	Dec. 31, 2022 USD ($)	Aug. 31, 2020 USD ($) aircraft	Dec. 31, 2019 USD ($)	Nov. 30, 2019 USD ($) aircraft	Dec. 31, 2018 USD ($)	Apr. 30, 2013 USD ($)
Fixed rate special facility bonds, due through 2036
Debt Instrument [Line Items]
Principal amount							$ 42,000,000
Debt instrument, net amount							43,000,000
Debt instrument, unamortized premium							$ 1,000,000
Fixed Rate Enhanced Equipment Notes, 2019-1 Equipment Notes | Long-term Debt
Debt Instrument [Line Items]
Principal amount					$ 772,000,000
Fixed Rate Enhanced Equipment Notes, 2019-1 Equipment Notes | Long-term Debt | Airbus A321
Debt Instrument [Line Items]
Number of aircraft, secured debt transactions | aircraft					25
2019-1 Series AA, due through 2032 | Long-term Debt
Debt Instrument [Line Items]
Principal amount					$ 589,000,000
Debt instrument, interest rate, stated percentage					2.75%
2019-1 Series A, due through 2028 | Long-term Debt
Debt Instrument [Line Items]
Principal amount					$ 183,000,000
Debt instrument, interest rate, stated percentage					2.95%
2019-1 Series B, due through 2027 | Long-term Debt
Debt Instrument [Line Items]
Principal amount			$ 115,000,000
Debt instrument, interest rate, stated percentage			8.00%
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt
Debt Instrument [Line Items]
Principal amount			$ 808,000,000
Fixed rate enhanced equipment notes, 2020-1A and B | Long-term Debt | Airbus A321
Debt Instrument [Line Items]
Number of aircraft, secured debt transactions | aircraft			24
2020-1 Series A, due through 2032 | Long-term Debt
Debt Instrument [Line Items]
Principal amount			$ 636,000,000
Debt instrument, interest rate, stated percentage			4.00%
2020-1 Series B, due through 2028 | Long-term Debt
Debt Instrument [Line Items]
Principal amount			$ 172,000,000
Debt instrument, interest rate, stated percentage			7.75%
Fixed rate equipment notes, due through 2028
Debt Instrument [Line Items]
Principal amount		$ 11,000,000		$ 219,000,000		$ 567,000,000
Fixed rate equipment notes, due through 2028 | Long-term Debt | Airbus A321
Debt Instrument [Line Items]
Number of new aircraft held as security | aircraft	23
2024 Floating Rate Equipment Notes
Debt Instrument [Line Items]
Principal amount	$ 662,000,000

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